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Pension and other post-employment benefits - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Employee Benefits Disclosure [Line Items]      
Defined contribution pension plan cost $ 14,652 $ 14,521  
Accumulated benefit obligation for pension plan 792,353 827,559  
Pension benefits      
Employee Benefits Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 620,739 610,209 $ 568,982
Expected employer contributions for next year 20,311    
OPEB      
Employee Benefits Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 201,698 193,782 $ 172,167
Expected employer contributions for next year 3,963    
Private Equity Funds | Level 3      
Employee Benefits Disclosure [Line Items]      
Defined benefit plan, plan assets, amount $ 29,733 $ 26,380